pawn
most numerous but the weakest piece in chess
rook pawn
pawn on the a or h file
passed pawn
in chess, a pawn with no opposing pawns to prevent it from advancing to the eighth rank, either on the same file or adjacent files
hanging pawn
two pawns on the same rank on adjacent files with no pawns of the same color on the files either side of them
isolated pawn
pawn which has no friendly pawn on an adjacent file
connected pawns
two or more pawns of the same color on adjacent files
backward pawn
pawn that is behind all pawns of the same color on the adjacent files and cannot be safely advanced
black pawn
chess piece