Cuatrillo (capital: Ꜭ, small: ꜭ) (Spanish for "little four") is a letter of several colonial Mayan alphabets in the Latin script that is based on the digit 4. It was invented by a Franciscan friar, Alonso de la Parra, in the 16th century to represent the velar ejective consonant /kʼ/ found in Mayan languages, and is known as one of the Parra letters.
A derivative of the cuatrillo by adding a diacritic, ⟨Ꜯ ꜯ⟩, was used for the alveolar ejective affricate /tsʼ/ found in the same languages.
The cuatrillo is encoded in Unicode at the code points U+A72C Ꜭ LATIN CAPITAL LETTER CUATRILLO and U+A72D ꜭ LATIN SMALL LETTER CUATRILLO, respectively. The cuatrillo-commas are at U+A72E Ꜯ LATIN CAPITAL LETTER CUATRILLO WITH COMMA and U+A72F ꜯ LATIN SMALL LETTER CUATRILLO WITH COMMA.
As an example of use, the letter appears when spelling the name of the Kʼicheʼ language in the Parra orthography: ꜭiche.[1]
Well, that’s interesting to know that Psilotum nudum are known as whisk ferns. Psilotum nudum is the commoner species of the two. While the P. flaccidum is a rare species and is found in the tropical islands. Both the species are usually epiphytic in habit and grow upon tree ferns. These species may also be terrestrial and grow in humus or in the crevices of the rocks.
View the detailed Guide of Psilotum nudum: Detailed Study Of Psilotum Nudum (Whisk Fern), Classification, Anatomy, Reproduction