What are the tattoos on Shadowhunters?

Runes, also known as Marks, are symbols that grant beings various supernatural abilities, with both angelic and demonic runes known to exist. For Shadowhunters, runes are a complex runic language given to them by the Angel Raziel, which grants them powers beyond those of mundanes.

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In respect to this, did the celts use runes?

No. The Celts, who were a subset of the Gauls, used either the Greek alphabet, borrowed from the Greek cities along the south coast of Gaul, or a modified version of the Roman alphabet, adding a few extra Greek letters for sounds the Romans didn't have. You can also ask what were anglo-saxon runes used for? The runes were used to write things like significant names, places, spells and religious rituals. The runes within the Anglo-Saxon alphabet are made of combinations of straight lines so that they could easily be carved into wood or stone. Many runes have been found carved into stone, which are known as runestones.

Keeping this in consideration, can tessa gray use runes?

Tessa is a new kind of hybrid and it's a bit different when it comes to her because even though runes don't work on her, they also don't harm her. She's the only hybrid (that we know of) that is actually not a Shadowhunter and more of a warlock (which she is often described as) despite having Shadowhunter blood. Where do angelic runes come from? The Angelic Power rune is one of the Marks given to the Nephilim by the Angel Raziel. The Rune is typically bestowed upon a Shadowhunter at the end of his/her training through a Rune Ceremony. The ceremony is attended by the Shadowhunters' loved ones or trainers, and the rune is placed on them by a Silent Brother.