Combo

A combo is an indeterminate number of tricks performed back-to-back, though not necessarily equivalent to a string. Strings are typically built up of multiple combos separated by bails.

Consider the following string:

Blur>Parkwalk>Drifter>Infinity>Ducking Clipper>Spinning Butterfly>DLO

There are multiple ways to group it into combos, but it could be said to start with a 3-trick combo (Blur>Parkwalk>Drifter), and end with a 2-trick combo (Spinning Butterfly>DLO), with Infinity>Ducking Clipper in between separating the two combos.

Link
A 2-trick combo is referred to as a link.