This question inspired by a suggestion from Prabhu

Identify this equation:

And without further ado, clues:

.

Lots of jobless people, namely Arun Krishnamoorthy , Anuj , BiGFooT , bs , Swetha , Vinod , Ganesh Prasad , nihit , Preetish , Tathagata Chatterjee , jayanth , ram , Gammafunction , Shashank , Abhishek , alephnull , prasanth , yaksha , Mahesh Herle , pratap , Prasad , and udupendra , took the time to point out that:

This is the Drake Equation.

Some more people went on to identify that

(1) is the WOW! signal, and (2) is the Arecibo message, considered very likely to be our first interplanetary I/O operations (respectively) :-)

Arun Krishnamoorthy, Anuj, BiGFooT, bs, Swetha, Vinod, Ganesh Prasad, nihit, Preetish, Tathagata Chatterjee, jayanth, ram, Gammafunction, Shashank, Abhishek, alephnull, prasanth, yaksha, Mahesh Herle, pratap, Prasad and udupendra