This list is non-exhaustive, more operators will be added in the upcoming LIGO releases.
|Address that initiated the current transaction|
|Address that initiated the transaction, which triggered the current transaction. (useful e.g. when there's a transaction sent by another contract)|
|Amount of tez sent by the transaction that invoked the contract|
|Timestamp of the block whose validation triggered execution of the contract, i.e. current time when the contract is run.|