Elements individually as「plant」with「flow of night soil with squatting spread feet.」The fruit of this plant is somewhat diamond shaped.「Plant」with「pass over, traverse」perhaps describes the manner in which the leaves of this aquaculture plant traverse, pass over the surface of the water being held up from beneath, or, the manner in which trematode flukes (intestinal worms) causing fasciolopsiasis are passed over to a new host when the fruits are eaten raw or undercooked (always eat your worms fully cooked).「…[T]he larval flukes leave their water snail hosts, and swim away to form cysts on the surfaces of water plants, including the leaves and fruit of water caltrops. If infected water plants are consumed raw or undercooked, the flukes can infect pigs, humans and other animals.」
　　[　https://en.wikipedia.org/wiki/Water_caltrop 2013-04-26　]　
　The RHOMBUS or DIAMOND SHAPE can be derived by picturing a service provider lying on her backside with each of her feet placed above her head…the four sides of a rhombus shape would be created by her two legs bent at the knees, being worked by「emerging shafts」with「twisting screwing crotch, skilled technique, held up from beneath, mushroom head in crotch, unrestricted access」and so on…also a manner in which trematode flukes (intestinal worms) causing fasciolopsiasis are passed over to a new host, but this time the infection site is the next guy's penile meatus…what a lovely thought.
　Moreover, the RHOMBUS or DIAMOND SHAPE can also be derived by picturing a male with「emerging shaft and fluids flowing from mushroom head between spread feet」whilst sitting on the floor and jerking off with a new technique, and so on.「Coprophilous」means「shit-loving」as in breaking new ground, night soil, and so forth, something akin to masturbating with your own feces (as suggested by David Mills in Se7en), shasturbating, scaturbating, shatsurbating ad infinitum.
　Without a doubt, the Irish also have knowledge of their own to pass along in these trying times:「Masturbation will not spread coronavirus, especially if you wash your hands (and any sex toys) with soap and water for at least 20 seconds before and after.」Nonetheless and regrettably, unlike in dynastic China, it must be undertaken alone to truly be a preventative countermeasure but still achieve the desired result with some degree of safety.
　 　[　https://www.sexualwellbeing.ie/sexual-health/sex-and-coronavirus/ 2020-03-31　]　
　The Dutch, too have the same solution—it seems masturbation has become mainstream in the media the world over due to the coronavirus (it has always been 'the main stream' in reality, albeit covertly for most folks):
　「'Don't have sex with your partner if they have been isolated because of (suspected) coronavirus infection,' the RVIM says. 'Sex with yourself or with others at a distance is possible (think of telling erotic stories, masturbating together).'」
　　[　https://www.theguardian.com/world/2020/may/15/dutch-official-advice-to-single-people-find-a-sex-buddy-for-lockdown-coronavirus 2020-05-16　]　
　Needless to point out perhaps, but Chinese shamans from antiquity hit upon the same solution as a pandemic preventative countermeasure, honed for ultimate client satisfaction by utilizing naked females with no-longer-integrated feet as masturbatory sex buddies available for short-term rental with erotic visualization of live prepubescent female genitalia engaging in autoerotic stimulation herself, as a solution to the same problem facing us now, but in pre-Internet days.

Modern definitions (that generally disregard history) …excluding politically incorrect concepts and other meanings deemed offensive today; may list only pigeonholed definitions, euphemisms, or meaningless mnemonics)
Chinese: Trapa natans; water caltrop
Japanese: Trapa japonica, caltrop, caltrap
Unihan extended: water-chestnut, water caltrop
EDRDG: diamond (shape); water chestnut; rhombus