That'd be the Cyclomatic Complexity
Of which there are two major variations. Unfortunately, the swiss chese that often populates my cranium cannot off the top of my head describe the differences...it's off to Google....
jb4
shrub\ufffdbish (Am., from shrub + rubbish, after the derisive name for America's 43 president; 2003) n. 1. a form of nonsensical political doubletalk wherein the speaker attempts to defend the indefensible by lying, obfuscation, or otherwise misstating the facts; GIBBERISH. 2. any of a collection of utterances from America's putative 43rd president. cf. BULLSHIT