Accounting is usually boring and non-dramatic, except when accountants are faced with releases from restrictions when dealing with non-profits. This is when you see accounting types, such as CPAs and auditors, especially those with no non-profit background, laughing a bit too nervously. Blame it all on FASB 117!
"Net assets released from restrictions" (NARFR) is not just one account. You have these accounts in all the net assets or funds. Basically these accounts are part of a FASB 117 mechanism to decrease temporarily restricted net assets, since most if not all expenses are presented in the unrestricted fund.
For example, you received a donation of $5,000 to be used for a program happening in the following year.