Ideas:

1. I have recently studied this general type of glyph closely and found that it often has signs; like being bent, having one or more 'cut'-marks across its length (in different directions and with different distances between the marks) or signs in the form of length and / or width. Also the short ends may be straight (horizontal or oblique) or inwards bent. The glyph we are looking at here, though, is not common, where one short end is straight and the other inwards bent (or consisting of two short straight lines inwards oriented?).

Trying to classify length and width I find this glyph being broad and of normal length. It is broad in comparison with e.g. the 'shaft' in Ea5-5.

2. Exactly the same type of glyph is found in Friday. There it has a variant of the 'hiding' glyph at its right. Therefore it might be guessed that we should read this glyph in Monday as signifying the light phase of the Moon. However, I doubt that this is its meaning. If so, then should we not find a 'hiding' glyph in Monday too?

Instead I propose that we consider the possibility that this glyph means 'measurement staff', 'time giver' or something similar. The moon is the primary time giver not only for the month but also for the time of the night. And Venus is a most regular planet with a very interesting cycle.