The sedra Bamidbar includes a scribal tradition that is a little unclear in it's form. The Ba'al Haturim notes of Numbers 1:22 that the lamed in livney Shim'on... l'gulg'loteyhem (the sons of Shim'on ... According the their head count should be akumah l'matah (bent downward). However it is not clear what this actually means, both which lamed we are talking about - since there are four or how it might look. The assumption is that it is similar to the way Yemenite scrolls or handwritten Chumashim depict all lameds with a slanting or bowed head at the top of the letter.
Torah Sh'lema shows the first two lameds in the word l'gulg'lotam drawn this way, but not that of the word livney.
The Ba'al Haturim explains that it/they are bowed this was to symbolise the diminishment of the tribe by a famous member, 'Zimri son of Salu sinned [with the Midianite woman Cozbi daughter of Zur] and from his tribe they fell. And the lamed is the highest of all the letters, thus was there a missing [element] from his tribe, for there did not arise a king or a prophet [from it].

Some manuscripts of the Ba'al Haturim go on to note that the second lamed in gulg'loteyhem (ie the third in the whole word) should be 'made like a saw and erect, and it does not have a cap on its head'.
Again this in unclear but is largely interpreted as being a staight line as an ascender only - ie a vav without a head. However this doesn't explain the saw. Or Torah explains the word m'gerah as a waterspout but this isn't generally accepted. The Gaster manuscript has a little triangular golf flag on the back of the letter - possibly reflecting a tooth from a saw but does have the straight line ascender next it. Torah Shl'emah does not talk about the little flag.

For the Ba'al Haturim this similarly refers to Zimri who 'did lewd acts in Israel with raised head and in a proud (ie erect) manner).

Unlike the tribe of Shim'on whose lamed heads are akum (bent) - presumably ashamed of their leader's acts, the leader himself is quite unashamed and proudly stands z'kuf (upright, erect) and the different lameds reflect this. How often does someone do this? Brazenly showing or stating their own views without thought for the consequence and embarrassment that might cause.for their family and friends.