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The marks on a monument that identify something specific rather than expressing something general. A square and compasses identifies a Freemason; three intact links identify an Odd Fellow; a Commonwealth war grave headstone follows a published specification under which nearly everything carved on it can be checked against a register. This is the group where a reader can expect a definite answer, and it is worth knowing that the three intact links of the Odd Fellows are routinely mistaken for a broken-chain mourning motif — the difference is whether the chain is broken, and there are exactly three.
A carpenter's square and a pair of compasses interlocked, the emblem of Freemasonry.
Three interlinked chain rings, the emblem of the Odd Fellows.
A uniform rounded-top headstone bearing a unit badge, name and optional emblem.