Tile Dock symbols
A symbol on Tile Dock is a picture in a cell. Golden Buffalo might use an animal. Crystal Cave might use a stone. The picture is identified in that board's paytable, not in this paragraph, because the files are not one shared sprite sheet.
How to read a line
Open Ancient Rome as a guest if you want a live example. Find the paytable control inside the frame. A row usually pairs an icon with a virtual-credit number for three or more on a line. That number lands on the board's meter when the result says so. It does not land on the XP total. XP does not care which symbol landed.
Lines
Some boards pay on fixed lines. Some pay on ways that count neighbours. The legend in the frame is the authority for that file. A note on this site will not override it, and it will not quote a return percentage, because we are not publishing a cash-game sheet.
Locked boards
Cleopatra Gold's symbols are visible as the round preview before you sign in. The moving window is not. After sign-in the window and the legend open together. If the legend uses a word like coin, read it as the sprite's name.
Compare two legends only after both frames have loaded. Guessing from the title is how the glyph boards get treated as a history lesson. They are not one.