what does this layer's icons mean

[MOHAMMAD_BATAYNEH]

I wanted to know what each layer status related to because I've been learning about layer properties filters for the last 2 days but have not figured it out yet. I appreciate it.

[AllenJessup]

See if this helps;

https://help.autodesk.com/view/ACD/2019/ENU/?guid=GUID-B297EBD9-D68C-47E1-87CE-1B3798496599

[changmarin]

Those are used for filters settings.  You will have to read a bit about it...   😁

[tcorey]

Has Objects -- Blue Sheet

Has no Objects -- White Sheet

Has Objects and Layer Overrides -- Blue symbol

Has no Objects and does have Layer Overrides -- White symbol

I can figure out those other ones. It's a mystery wrapped in an enigma.