A "glyph" is merely the term for a specific character in a font file.
Photoshop, unlike other Adobe applications, has no Glyph panel. While it can display and utilize glyphs if they are present, there is no way to access a specific glyph from within Photoshop.
Both Illustrator and InDesign have Glyph Panels which allow you to see and access all glyphs present in a font.
So the short answer.... Photoshop has no way to access glyphs.
There are also many freeware/shareware apps which can show the glyphs in a font file. To utilize a specific glyph in Photoshop, you need to find an app, any app, that allows you to see the glyphs. Then simply copy/paste the glyph from that app to Photoshop.
You may already possess an app capable of showing the glyphs. For example, you can use
Insert > Symbol in MicrosoftWord to view the glyphs in a font. Word simply refers to them as "Symbols". Then copy/paste the one you want into Photoshop.