Is there a term for a solo break without the rest of the band stopping?

Question

In jazz, a soloist often takes over after another soloist at the end of the previous chorus, rather than wait until the first measure of their own chorus. Essentially this is a pickup bar (or several bars). If everybody else stopped playing, that would be called a solo break. However, is there a proper term for this other, non-soloed "solo break"?

How do I notate in a score if I want the soloist to improvise something catchy as a lead-in to their solo? (I know this possibility is implied by default, everybody knows this and it's probably bad taste to even mention this but in written music you have to be explicit.) Bars with slashes and "ad lib." underneath?

Answer 1

Don't think I've ever heard it called anything but just a 'pickup'. Write 'solo' or 'solo pickup' at the appropriate point.

Answer 2

There's no standard practice for this. Just write "begin solo" at the spot where you want the first or next soloist to cut in.