There is no standardized collective noun for a group of rubbish. However, collective nouns are an informal part of language; any noun that suits the context can function as a collective noun; for example, a heap of rubbish, a bag of rubbish, a bin or rubbish, or barrel of rubbish.

A site where garden rubbish and kitchen waste are decomposed by microorganisms.

it mean back in the olden days

There is over 50 tonnes of rubbish on Mount Everest, including a helicopter, oxygen canisters and food waste. There is so much rubbish that it is sometimes called the world's largest rubbish heap!

The difference between Binomial heap and binary heap is

Binary heap is a single heap with max heap or min heap property

and

Binomial heap is a collection of binary heap structures(also called forest of trees).