Code coverage means, how well your test set is covering your source code. i.e. to what extent is the source code covered by the set of Test cases. As mentioned in above answers, there are various coverage criteria, like paths, conditions, functions, statements, etc.
Chiasmus. Definition: Chiasmus is a specific type of parallelism. It consists of two parallel phrases in which corresponding words or phrases are placed in the opposite order.
1 Parallel muscles are the most abundant and typical, with fascicles arranged parallel to one another.  Convergent muscles are similar to parallel muscles in attachment, although fascicles do not run parallel to one another, producing a broader muscle.