LoadString (Method)
From Legacy Roblox Wiki
Example
This code will load the string saved under the key "hi".
game.Players.PlayerAdded:connect(function(player) --Connection line. Fires when a player leaves the game.
player:WaitForDataReady() --Waiting for the player's data to be ready.
print(player:LoadString("hi")) --Prints to the output whatever value is saved to the key "hi" in that player.
end
end)