A questioner said:
What is this iron thing installed into the wall of my late-Victorian house?

Some of the answers here:

1. It’s a hose bib handle someone used as an air vent by mortaring it in. The contemporary equivalent would be an “Air Brick” – the purpose is to prevent condensation from building up in the void between the outer brick and the inner layers of the wall, leading to the breakdown of the mortar. Given the climate of England, preventing dampness in wall voids is important. Given the history of England in the last century, it’s likely someone had to be handy in a time of scarcity, and improvised in a clever way.
2. It’s unlikely there’s a void in the wall – construction in Britain during this period typically used solid walls.
3. That’s assuming the house is entirely late Victorian, and even during the later part of the 19th century, cavity walls did exist.There’s also two different compositions of bricks and mortar in this photo alone, implying that work was done in stages or it had to be rebuilt. If this house is near Liverpool or Manchester, it may have also been damaged during the 1940s, at which point cavity walls were fairly standard (and even preferred, because of the demand for building materials).
4. Looks like a fancy weep hole.
5. It looks like a hose bib (faucet) handle, but in the event that it is, I have no idea WHY it was put there, other than maybe to be used as a vent cover of some type.
6. 

7. This small (10cm wide) possibly iron flower like thing is about 1m above ground. My house is in North West England and was built in the 1890s, it is a former shop, and this is on the side wall (i.e. away from what was the shop entrance). There is no visible outlet on the inside.

8. There are marks going down the wall on the wall to the right that seem to indicate there was some other building or something connected to the wall, a green house or potting shed other type of building
9. and it works as a mouse stopper
10. Would it though? The gaps are pretty big. Google says mice can get thru a 1/4” hole.

What do you think about it? Let us know in the comment!

Nestled within the picturesque streets of North West England, where the echoes of a bygone era still linger in the air, stands a testament to the enduring charm of late-Victorian architecture. Amidst the intricate details and storied history of a former shop-turned-residence, a peculiar iron fixture adorns the side wall, captivating the imagination of all who encounter its enigmatic presence. Rising approximately one meter above the ground, its delicate flower-like design serves as a silent sentinel, guarding secrets and mysteries waiting to be unraveled by those daring enough to explore its origins.

As the sun casts long shadows across the cobblestone streets, the occupants of the late-Victorian house are drawn to the iron fixture, their curiosity piqued by its unconventional appearance and obscure purpose. Built in the 1890s, during the peak of the Victorian era, the house bears the hallmarks of a bygone era, with its ornate facades and meticulous craftsmanship. Originally serving as a shop in a bustling commercial district, it has since transitioned into a residential abode, yet remnants of its past linger in the form of architectural anomalies and historical artifacts.

The iron fixture, situated on the side wall away from the former shop entrance, presents a curious anomaly amidst the familiar surroundings. Its flower-like design, wrought from sturdy iron, hints at a level of artistry and attention to detail that was characteristic of Victorian craftsmanship. Yet, despite its aesthetic appeal, the purpose of the iron fixture remains shrouded in mystery, leaving occupants and passersby alike to speculate about its intended function.

One plausible explanation for the presence of the iron fixture is that it served as a mounting point for signage or decorative embellishments associated with the former shop. In the bustling commercial districts of late-Victorian England, shop owners often adorned the exteriors of their establishments with ornate signage, awnings, or other decorative elements to attract customers and enhance the visual appeal of their storefronts. The flower-like design of the iron fixture suggests that it may have once supported a decorative feature such as a hanging basket or planter, adding a touch of charm and vitality to the exterior of the shop.

Alternatively, the iron fixture could have served a more utilitarian function, providing support for a canopy or awning that extended over the sidewalk to shelter pedestrians from inclement weather. In urban areas where foot traffic was common, especially in commercial districts bustling with activity, such features were not uncommon and served to enhance the comfort and convenience of shoppers and passersby.

Despite these speculative explanations, the true purpose of the iron fixture remains elusive, its origins lost to the passage of time and the vagaries of history. As the occupants of the late-Victorian house ponder the significance of this enigmatic feature, they are reminded of the rich tapestry of stories and secrets woven into the fabric of their home, waiting to be discovered by those who dare to delve into its past.