What is "Pension Adjustment" Box 52 on T4. I see the amount in Box 52, but what is this amount for?

[TurboTaxLise]

Pension Adjustment (PA) is an estimation of the value of an individual's pension, and the value assigned by the CRA every year to each accruing pension. 

Please see below for more information, if needed:

Line 206 – Pension adjustment - https://bit.ly/2XKUtiY

TurboTax Tip: Understanding pension adjustments - https://turbotax.intuit.ca/tips/tax-tip-understanding-pension-adjustments-5569