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This is an @ symbol, called 'at', or rarely 'asperand'

The @ is used informally in digital conversations and at marts

Example 1. '3 apples at $3' and Example 2. '3 apples @ $3'

have 2 completely different meanings

#1 means that you're buying 3 apples for $3, $1/apple

#2 means that you're buying 3 apples for $9, $3/apple

There are three people {John, Lucas, Edward} who play a game; the game is that John has a number in mind 1-100 and Lucas and Edward have to guess the number. Lucas says the number is between 70-90, but Edward says the number is 21. John's number was 84; Lucas's answer was ACCURATE, but Edward's number was PRECISE.

Hopefully this wasn't confusing

First of all, we need to look at the symbols used in this equation; they are 1 and 2, this means that this equation could be in base-3 or above, but let's just say base-10, so no confusion happens.

The way base-10 works is that there is 10 numerical symbols (called numbers); in ascending order, they are: 0, 1, 2, 3, 4, 5, 6, 7, 8, 9. If you don't know how numbers bases works, they work by using these numbers, you start with 0, then with succession (adding 1 each time) you reach nine. But how do you get to numbers past 9ʔ̦ by adding a '1' preceding the ones column (the column that changes by integer (any whole number, positive or negative) when using succession) all the way to 9. You repeat this process until you get into the 100s, where you repeat the process of adding a '1' preceding the tens column so on and so on, always adding a '1' preceding the closest column with the largest value.

So when you add 1 to 1, you are actually finding the number that succeeds 1, by 1 - in the base-10 format) which is the next number in the sequence, and that's 2.