What is the only road sign in Britain to be on an inverted triangle?

In Britain, the give way traffic sign is shaped like an inverted triangle. Drivers who encounter this sign at a junction are required to yield to traffic on the intersecting roadway.

A key difference between the stop sign and the give way sign is that a full stop is required only when encountering the stop sign. It is acceptable to slow down without completely stopping for the give way sign, depending on traffic conditions. It is very important for drivers to operate their vehicles in a manner that they will be able to stop, if necessary, when encountering either of these two regulatory signs.