ahhh... i get you!
if you need xtra info about Metron:
Designed originally for the Commerical Order in Czechoslovakia. Jiri Rathousky was commissioned in 1970 to make a Typeface for the new underground information system. Which he based on the original Metron Cut.
Metron is no longer the typeface of the metro in prague now, it is helvetica although on the A and B lines the original metal Metron casts still survive!