The word "alphanumeric" refers to any text that contains both letters and numbers. One example of this is the letter 'A' (which has a numeric value of 1). When creating a crypto wallet cryptocurrency exchange highly recommended the user sets a password with both letters and numbers to ensure that your crypto wallet is the safest it can be and will lesser the chance of your account being compromised. An example of an alphanumeric password is "abcdefg123456789".