Marker

In Magic: The Gathering, a marker is an object used to represent anything which isn't represented by a card.

The most common markers are tokens, emblems, and counters. Tokens and emblems are usually represented on the back side of marketing cards found in Magic boosters, while counters are often represented by marbles or dice.

Designations
Some designations are described "to act as marker".
 * Monstrous Monstrosity
 * Renowned Renown
 * City's Blessing Ascend

Some designations are not described as a marker by the rules.
 * Commander
 * Monarch

Player counters
When counters are placed on a player instead of an object it is often helpful to have a marker card to place these counter on.
 * Acorn Stash (Silver-bordered)
 * Energy Reserve
 * Experience
 * Poison Counter

Turn marker
The Grand Melee variant places great emphasis on turn markers. undefined

Venture marker
Venture markers were introduced in Dungeons & Dragons: Adventures in the Forgotten Realms. If you venture into the dungeon for the first time you put a dungeon of your choice into the command zone and put a venture marker on the first room, at the top. Your venture marker is a way for you to track which room you're in. A venture marker is something small that you can use to keep track of what room you are in, for example a coin, a bead, a die or a miniature.

Zone marker
Some marker cards were printed to highlight a placement of a card in a zone or other game area.
 * On an Adventure (Exile) Adventure
 * Companion (Sideboard) Companion
 * Foretell (Exile) Foretell