For anyone else who is wondering what a biciron is, apparently it's a t-shaped iron wedge that a blacksmith uses to shape metal against. The name seems to come from a contraction of iron beak, in all the references I came across online it is written as two words "bic iron".

https://www.hobby-machinist.com/threads/anvil-stand-question...

https://www.practicalmachinist.com/vb/antique-machinery-and-...