T-square and Try square

T-square noun - A square used by draftsmen to draw parallel lines.

Try square and T-square are semantically related. In some cases you can use "Try square" instead a noun phrase "T-square".

Try square noun - A square having a metal ruler set at right angles to another straight piece.

T-square and try square are semantically related. Sometimes you can replace phrase "T-square" with "Try square", this phrases are similar.