...Its function is to make a sign as a condition for perceiving again that 'this
is the same', as carpenters, etc., do in the case of timber...
Citta only experiences or cognizes an object; it does not 'mark' its object.
Saññā marks the object so that it can be recognized later. Whenever we
remember somethings it is saññā, not self which remembers. It is saññā
which, for example, remembers that this colour is red, that this is a house, or
that this is the sound of a bird