Monogram

	Monogram
	<a href="/wiki/File:Monogram.png" class="image" title="Monogram image"><img alt="Monogram image" src="/w/images/4/4a/Monogram.png" decoding="async" width="145" height="113" /></a>
	<a href="/wiki/File:Monogram.png" class="image" title="Monogram image"><img alt="Monogram image" src="/w/images/4/4a/Monogram.png" decoding="async" width="145" height="113" /></a>
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Pattern type	Oscillator
Number of cells	18
Bounding box	7×7
Frequency class	40.9
Period	4
Mod	2
Heat	14
Volatility	0.88
Strict volatility	0.88
Discovered by	Dean Hickerson
Year of discovery	1989
Rules
Outer-totalistic rules	B3/S23 – B3678/S023678
Important rules	Conway Life, HighLife
# of rules	27 = 128
Isotropic rules	B3einy/S2-n3e – B2ekn34-aeik5-nr678/S01c234-z5-e678
Glider synthesis
Fewest gliders	10
Catagolue-generated RLE	monogram_synth.rle
Uploaded synthesis RLE	monogram_synth.rle
Pattern files
Plaintext	monogram.cells
RLE	monogram.rle
Identifiers
apgcode	xp4_hv4a4vh
Pentadecathlon ID	18P4.1

Monogram (or initials^[1] or JHC^[2]) is a period-4 oscillator that was found by Dean Hickerson on August 11, 1989.^[3] It produces some weak sparks which can utilized in e.g. the stabilization of the carnival shuttle.

It first appeared semi-naturally in September 2014 in a soup found by Josh Ball using apgsearch.^[4] It later appeared in an asymmetric soup on May 5, 2015.^[5]

References

↑ "Initials". The Life Lexicon. Stephen Silver. Retrieved on June 13, 2009.
↑ "JHC". The Life Lexicon. Stephen Silver. Retrieved on April 30, 2009.
↑ Dean Hickerson's oscillator stamp collection. Retrieved on March 14, 2020.
↑ Josh Ball (September 28, 2014). Re: Soup search results (discussion thread) at the ConwayLife.com forums
↑ Lewis Patterson (May 5, 2015). Re: Soup search results (discussion thread) at the ConwayLife.com forums