Does only ball-point count as 'biro'?
I ask as in North America it's usually called a 'Bic' or a 'ball-point'.
(
Tahkcalb ω∞ for sigs,
Thu 3 May 2012, 0:11,
archived)
A biro normally refers to the clear plastic (or sometimes orangey yellow) ones with a cap.
But since they all write the same I guess any ballpoint would do for this compo.
(
Photoshop Bitch 2014 edition,
Thu 3 May 2012, 0:18,
archived)