pronounced as 1 letter, and written with 3, 2 letters there are, and 2 only in me. i’m double, i’m single, i’m black blue, and gray, i’m read from both ends, and the same either way. what am i?

Let's analyze the riddle step-by-step:

Riddle Breakdown

• "pronounced as 1 letter,"
  The answer sounds like a single letter when spoken.

• "and written with 3, 2 letters there are, and 2 only in me."
  This is a bit tricky, but it hints that the word has 3 letters, of which 2 are the same (only 2 unique letters).

• "i’m double, i’m single,"
  Could mean the word contains a double letter and a single letter.

• "i’m black blue, and gray,"
  This suggests the word is associated with colors: black, blue, and gray.

• "i’m read from both ends, and the same either way."
  The word is a palindrome (reads the same forwards and backwards).

Putting it all together

• A 3-letter palindrome with 2 unique letters (one letter appears twice), that sounds like a single letter when pronounced.
• Associated with colors black, blue, and gray.
• Examples of 3-letter palindromes with 2 unique letters: "eye", "eve", "mum", "dad", "bob", "gig", "pip", "pop", "tot".

Among these, "eye" stands out:

• Pronounced like the letter "I" (sounds like a single letter).
• Written with 3 letters: E, Y, E (2 unique letters: E and Y).
• Has a double letter "E" (at start and end) and a single letter "Y" in the middle.
• Eyes can be black, blue, gray in color.
• "eye" is a palindrome.

Final Answer

The answer is "eye".