[masklinn]

Other possible alternatives (somewhat more limited in number so longer strings) would be box drawing characters[0] or game blocks (mahjong[1], tiles[2] or cards[3]).

[0] https://en.wikipedia.org/wiki/Box_Drawing

[1] https://en.wikipedia.org/wiki/Mahjong_Tiles_(Unicode_block)

[2] https://en.wikipedia.org/wiki/Domino_Tiles

[3] https://en.wikipedia.org/wiki/Playing_cards_in_Unicode#Playi...