A Locum is a person who temporarily fulfills the duties of another, the term is especially used for a physician and for this reason we took inspiration from the graphical representation of a heartbeat as measured by an EKG.
The word locum is short for "locum tenens", a Latin phrase meaning "place holder" which is represented here by the white space around the word "Locums". The "Rx" and heartbeat form a holder into which the word "Locums" is placed.
The "R" in "Rx" is representative of the Latin word recipe, meaning "take," and the first doctor to use "Rx" used it as a verb with the same meaning, "Rx two aspirin" being equivalent to today's "Take two aspirin." (The word recipe had had the same function from the 13th through the 17th centuries.) Those two letters were a 19th-century take on a 16th-century symbol, the letter R with a line through its slanted leg-the line signaling that the "R" is functioning as an abbreviation. It wasn't till the early 20th century that "Rx" came to be used as the noun we know today. As for the noun "recipe," it followed the same trajectory, referring to a medical prescription for about 100 years before it developed its connection with cooking in the early 17th century.
Moving away from the usual blues and greens associated with the medical industry we opted to go with orange as the main colour.
Orange is the color of encouragement. The combination of yellow and red makes orange convey excitement, warmth and enthusiasm. Social and inviting, this is the color of the extrovert, exuding happiness and joy. It is a motivating and encouraging color and is widely associated with good health.