Here's a breakdown of the words:
* Piki: Means "to climb," "to rise," or "to ascend."
* Atu: Indicates direction, in this case, upwards.
* Ki: Indicates the destination.
* Te rangi: Means "the sky" or "the heavens."
This phrase is often used in a metaphorical sense, signifying reaching for something greater, achieving high aspirations, or a spiritual awakening.