Gaciça - Ted Kloba writes, "Here is Gaciça's new alphasyllabary script, which is based on the old alphabet (in the [Conlang Orthography] Museum). It has been rearranged and modified, and has taken on some elements of Gujarati."

Giantish - This linear writing system is used by Mathasian giants. It is a five-level system - there are five distinct sizes of letters (our Latin alphabet has three sizes, represented by m, b and p). The small red lines at the beginnings of the rows show where the baseline is located (where the base of the letters is); this is very important in a size-dependent system. Compare a handwritten lowercase g with the digit 9!

Glaitha-A - Glaitha-A was an alphabet used many years ago to write Mikiana. Today Mikianans just use the Latin alphabet, but stuff written in Mikiana centuries ago was usually written in this script. The word glaitha is Mikiana for "handwriting".

Glaitha-B - Glaitha-B is used by fairies to write Mikiana. It can be seen on the grounds of the Mika City School for the Supernaturally Gifted, where fairies are known to live.

Glingwin - A writing system created at the request of Jonathan Avidan; derived from a previous alphabetic script.

Gorwinion's Alphabet

Graeco-Roman - By augmenting the Latin alphabet with the Greek alphabet, one can assign a single letter to each American English phoneme.

Graffiti - This alphabet was designed for maximizing the accuracy of handwriting recognition, by simplying the individual characters or modifying them to make them more distinct from one another.

Grid Script - Writing Orientation
Right-to-left, then top-to-bottom

Syllabic Blocks
Each bulky block represents a syllable. The nucleus of a syllable is placed at the centre of the block. Onset is to the left of the nucleus and coda is on the right. Tone marker is either written above or below the nucleus according to pitch level of tones.

Syllable Separation
No syllabic delimiters. Even syllables are written a bit lower than the odd syllables to serve the purpose.

Vowel Letter Design
Simplify the IPA vowel graph into a six-boxed grid. Vowel letters are derived by removing some of the grid lines on the six-boxed grid. Use the unrounded front open vowel /a/ as an example, /a/ is located at the bottom left corner on the IPA vowel graph and the six-boxed grid as well. The two adjacent grid lines attached to the bottom left corner point are removed from the six-boxed grid. The modified grid is the letter for vowel /a/. All unrounded vowel letters are formed by removing two adjacent grid lines. For rounded vowel letters, only one adjacent grid line is removed.

Diphthong Letter Design
Similar to the formations of vowel letters, but this time remove the adjacent lines of the two vowels in a diphthong. Whenever appropriate, dots can be used to indicate the first component of diphthongs, in order to avoid confusions. For example, without marking the first component with a dot, the letters for /iu/ and /ui/ can be identical.

Consonant Letter Design
Break down a phoneme into components such as bilabial, plosive, alveolar, etc. Assign a symbolic letter to each component, reflecting some features of the component, for example, two horizontal lines for bilabial and U-shaped letter for nasal. Stack two most significant components of each consonant to form the letter. The stacking order is not regularized so as to increase the degree of freedom in aesthetics. Two or more consonant letters can line up to form new letters for consonant clusters.

Tone Marker Design
Hong Kong Cantonese has six tones. The third tone is considered to be a neutral tone and it is not marked. The first and second tones have higher pitch levels and the fourth, fifth and sixth tones have lower pitch levels. Markers for the former tones are placed above the nucleus letter in a syllabic block, while markers for the latter tones are placed below it. Markers for level tones are horizontal lines, while markers for rising and falling tones are L-shaped lines.