Correct, the process is "cash rounding" or "Swedish rounding" and all the details are here [1] for all the major countries that do it. In Canada:

- Prices are rounded down to the nearest multiple of 5 cents for sales ending in: 1¢ & 2¢ (rounded to 0¢); and 6¢ & 7¢ (rounded to 5¢).

- Prices are rounded up to the nearest multiple of 5 cents for sales ending in: 3¢ & 4¢ (round to 5¢); and 8¢ & 9¢ (round to 10¢).

[1] https://en.wikipedia.org/wiki/Cash_rounding#Rounding_with_0....