What does aleph mean in Psalm 119?

Could you please clarify for me the significance of the word "aleph" in Psalm 119? I understand that this passage is a song of praise to the law of God, but I'm curious about the specific meaning and role of "aleph" within its context. Is it a symbol, a metaphor, or does it carry a more literal meaning? How does it contribute to the overall message of the psalm? Thank you for your insight.