In the book ''Hellenistic Fortifications from the Aegean to the Euphrates'', McNicoll and Milner, the indented trace is equated with the French term ''en cremaillere'' (possessing an acute accent on the first e and a grave accent on the penultimate), which I looked up. Via Wikipedia (hardly a respectable source, but this article seems well-referenced) I can produce:
''During the 17th to 19th centuries the term was widely applied to lines of entrenchment that are usually formed in a saw-tooth pattern, known as indented lines, particularly during sieges.These lines are usually employed on banks of rivers, or on ground which is more elevated than, or which commands, that of the enemy. The defence of these lines is sometimes strengthened by double redans, and flat bastions constructed at intervals, along their front. Just such a constructed defence was used at Centreville in 1862 during the American Civil War.''
I am not an expert, remotely, but there seems to be some relation insofar as both forms consist of a defensive wall with [sharp?] projections or salients towards the enemy.
P.S. Feinman's definition is better than mine (which was merely a guess) and is supported by e.g. the walls of Colophon, which are quoted by McNicoll and Milner and seem to show minor topographical irregularities, following the landscape:
https://homepage.univie.ac.at/elisabeth....lophon.htm
Patrick J. Gray
'' Now. Close your eyes. It's but a short step to the boat, a short pull across the river.''
''And then?''
''And then, I promise you, you'll dream a different story altogether''
From ''I, Claudius'', by J. Pulman after R. Graves.