Is platform a proper noun

No, the Word platform is a common noun, a general Word for horizontal surface raised above surrounding surfaces; a general Word for the declared policy of a political party or group; a general Word for a place or opportunity for public expression of opinion; a general Word for a type of shoe with a very thick sole; a Word for any platform of any kind.

A proper noun is the name of a specific person, place, thing, or a title; for example:

• Platform Road, Middleville, NY
• Platform Bar & Restaurant, Greater London SE, UK
• BP Platform Rig Valhall, North Sea (Norway)
• "The Platform", a novel by James E. Garvey