That's pretty much standard notation, a position with parentheses is momentary, without is latched. Much cleaner to put parentheses around something instead of making a database field for momentary - and there are many variations wit momentary positions - you can get switches that are (ON)-OFF-ON, for example, double through momentary one way, or fixed on position the other.
Something else you can do is, if you see one that looks nice, pull up the manufacturer's data sheet and see if it is available in the style you want, SPST illuminated. Though the parametric search on Mouser and Digikey can do a pretty good job of pointing to exactly those that meet your criteria. But if you see one that looks like it would match your project design but are unsure, the data sheet would tell you if the manufacturer makes a switch that looks like that and has the function you are looking for. The datasheet will give you a part number, based on the options you want, and then you can search by that part number to find price and stock status.
Dave did a video a while back on doing parametric searches on the distributor web sites like Mouser and Digikey - worth watching if this is fairly new to you.