Special purpose acquisition company (SPAC). A special purpose acquisition company (SPAC), sometimes called a blank check company or an empty shell company, uses an initial public offering (IPO) to raise money it will use to purchase or merge with an existing company.
The objective of a cloverleaf is to allow two highways to cross without the need for any traffic to be stopped by red lights, even for left and right turns. The limiting factor in the capacity of a cloverleaf interchange is traffic weaving.
This molecule, called tRNA base-pairs with itself to form a cloveleaf structure. Each circle represents a single nucleotide (A, U, c, or G). Lines that connect different nucleotides represent the hydrogen bonds of base-pairing. In nature, the cloverleaf folds up into a L shape. This is the same molecule represented in the figure at left.