trace

Your cell phone company can put a trace on your line.

There are traces of chocolate around your lips.

The highway to the East Coast which ran through the borough of Ebbfield had always been a main road and even now, despite the vast garages, the pylons and the gaily painted factory glasshouses which had sprung up beside it, there still remained an occasional trace of past cultures.

[S]upposing the NP has raised in (18), the potential bindees are the clitic and the trace of the focalized NP, neither of which qualifies as a syntactic variable.