I imagine this is a very small sampling of the variations on safety pins – and what I use for closure or decoration on garments. Many times across a lifetime have I thought grateful thoughts for whoever invented them!
I don't know the purpose of the long one at the top with the bend along its length; it says Tomado Holland on the head. ?? It spans the breadth of a shawl very nicely with a weft effect.
The large and small one with a solid head are heavy and likely have some specified use, perhaps in industry.
The curved ones are diaper pins, I am pretty sure.
Kilt pins are recognizable.
The long ones without circles at the ends also mystify me.
The brass shower curtain ring slips easily through woven or knit or crochet fabric and acts as a closure as well as giving a loop on which to hang looped yarn from which the garment was made.
The stitch holders can be used likewise.
To the right of these is an interesting paper clip which 'pins' safely but not as handily.
If you can tolerate the damn red bouncing balls or know how to stop them this site tells about the inventor of the safety pin, Walter Hunt.